Mobile furnace delining machine



Nov. 28, 1967 SKENDROVIC 3,354,967

MOBILE FURNACE DELINING MACHINE Filed Oct. 25, 1965 5 Sheets-Shem l INVENTOR. ZAWRf/VCE QSxslvokol/zc QT-rave 5.77

Nov. 28, 1967 SKEN DROVlC MOBILE FURNACE DELINING MACHINE 5 Sheets-Sheet 2 Filed Oct. 23, 1965 INVENTOR. 4 wmszvcs 6x5 IVDROl/IC.

Nov. 28, 1967 L. SKENDROVIC MOBILE FURNACE DELINING MACHINE' 5 Sheets-Sheet Filed Oct. 23, 19 65 m MW Q 3 W r 22 N Nov. 28, 1967 L. SKENDROVIC MOBILE FURNACE DELINING MACHINE 5 Sheets-Sheet 4 Filed Oct. 23, 1965 INVENTOR. LAWRENCE \Sms/vaRowc.

Nov. 28, 1967 i L. SKENDROVIC 3,354,967

MOBILE FURNACE DELINING MACHINE Filed Oct. 23, 1965 5 Sheets-Sheet 5 I N VENTOR. Mmzszvcs Jms/vono vzc.

in: a 7- 7-0 E'A s r' United States Patent Ofilice r I 3,354,967 e MOBILE FURNACE DELINING MACHINE Lawrence Skendrovic, 402 Glencoe Drive, West Mifllin,.Pa. 1512 Filed on. 2s,-196s,.ser'. No. 504,024 Claims. (Cl. 17343)- This invention relates to a mobile furnace delining machine and more particularly to a mobile delining machine having a percussive tool universally mounted on the end of a Cylindrical telescopic tubular boom.

In large industrial furnaces such as blast furnaces and the like, it is necessary to periodically replace the refractory furnace lining, Before a new refractory lining can be installed it is necessary to remove the existing refractory lining from. the furnace wall. The refractory lining'is removed from the furnace walls by distintegrating and dislodgin'g the refractory material with a percussive tool. Removal of the lining is simplified where the percussive tool is irfihedded in the refractory material and is used as a lever to break off or dislodge relatively large pieces of the refractory material. The procedure of imbedding the percussive tool in the refractory lining and thereafter using the tool as a lever to break away portions of the lining exerts substantial bending forces on the various components of the machine. The machine must, therefore, be rugged in construction and capable of withstanding the bending forces exerted thereon during the delining operation.

The machine must also be capable of rapidly positioning the percussive tool in a desired position, rapidly penetrating the refractory material and thereafter exerting sufficient force to break and dislodge a relatively large piece of refractory lining and thereafter quickly reposition the percussive tool and again penetrate the lining and dislodge another relatively large piece of the refractory lining.

The present invention is characterized by having a cylindrical telescopic tubular boom member pivotally connected to a platform so that the boom is pivoted about an axis transverse thereto. The platform. is adjustably mounted on a frame so that it is free to rotate through 360" in either direction. The cylindrical tubular boom has a self-contained hydraulic actuator for telescopically adjusting the length of the boom. A tool holder is connected to the end portion of the boom by a mounting head that has a self-contained hydraulic actuator to pivot the tool holder about an axis transverse to a longitudinal axis of the telescopic boom. A percussive tool is mounted in the 'tool holder and is operable to be positioned by self-contained hydraulic actuators in the cylindrical telescopic tubular boom and the mounting head. 7 In another embodiment of the invention the mounting head for the" tool holder has a self-contained hydraulic actuator to pivot the tool holder about an axis' transverse to the longitudinal axis of the telescopic boom and also about an axis parallel to the longitudinal axis of the tubular boom. I

Accordingly, the principal object of this invention is to provide a furnace delining machine that is rugged in construction, versatile in operation and is capable of withstanding substantial bending forces exerted thereon during the removal of refractory linings,

Another object of this invention is to provide a machine having a cylihd'rical' tubular extensible boom with a self-contained hydraulic actuator for telescopically adju'sting the end of the Boom.

Another object of this invention is to provide a furnace delining machine having a tool holder connected to the end portion of a cylindrical nonrotatable telescopic tubular boorn' by a mounting head that has a self-contained hydraulic actuator to pivot the tool holder relative to the telescopic boom.

3,354,967 Patented Nov. 28, 1967 Another object of this invention is to provide a furnace delining machine that has a tool. holder connected to an endportion of a telescopic boom that has a self-contained hydraulicactuator for substantially universally positionaing the tool holder relative to the boom.

These and other objects and advantages of this invention will be more completely disclosed and described in the following specification, the accompanying drawings and the appended claims.

In the drawings:

FIGURE 1 is a top plan view of the delining machine illustrating in phantom lines the manner in which the boom mounted. thereon is rotatable relative to the support frame.

FIGURE 2 is a view in side elevation of the machine illustrated in FIGURE 1 illustrating in phantom lines how the tubular boom is pivotally connected to the platform and pivots about a transverse axis of the boom member. FIGURE 2 also illustrates in phantom lines the telescopic feature of the boom member and the connection of the tool holder to the end portion of the. boom.

FIGURE 3 is a view of the delining machine in front elevation with the percussive tool removed illustrating the turntable for mounting the platform on the track mounted frame.

FIGURE 4 is a fragmentary view in section and in elevation illustrating the drive mechanism for the tumtable.

FIGURE 5 is a fragmentary view in side elevation illustrating the actuating mechanism for pivoting the boom on the platform.

FIGURE 6 is a view partially in section of the double acting telescopic boom with the self-contained hydraulic actuator.

FIGURE 7 is a view in end elevation of the boom illustrated in FIGURE 6.

FIGURE 8 is a view in section of FIGURE 6 taken along the line 88 illustrating the inner and outer tubular cylindrical members, the annular hydraulic cylinder therebetween, and the splined connection between the telescopic portions of the boom.

FIGURE 9 is a fragmentary view in side elevation illustrating the mounting head with the tool holder mounted thereon.

FIGURE 10 is a view in front elevation of the tool holder mounting head and tool holder illustrated in FIG- URE 9. I

FIGURE 11 is a view in section taken along the line 1111 of FIGURE 10 illustra'in'g the self-contained hydraulic actuator for rotating the tool holder about an axis transverse to the longitudinal axis of the tubular boom.

FIGURE 11a is a view in end elevation taken along the line lla lla in FIGURE 11 illustrating the passages for the hydraulic fluid and the side walls of the hydraulic cylinder.

FIGURE 12 is a view in vertical section of a tool holder mounting head taken along the line 1212 in FIG- URE 13 illustrating the self-contained hydraulic actuators operable to rotate the tool holder about a first axis parallel to the longitudinal axis of the tubular boom and about a second axis transverse to the longitudinal axis of the tubular boom.

FIGURE 13 is a perspective view of the tool holder mounting head illustrated in FIGURE 12.

FIGURE 14 is a view in end elevation taken along the line 1414 in FIGURE 12 illustrating the passages for the hy'draulic fluid.

FIGURE 15 is a view in section taken along the line 1515 of FIG URE 12 illustrating a portion of the selfcontained hydraulic actuator for rotating the boom relative to the longitudinal axis of the telescopic boom.

Referring to thedrawings' and particularly to the FIG- 3 URES l, 2 and 3 the machine generally designated by the numeral has a base frame member 12 with a pair of endless treads 14 and 16 to propel the machine. The endless treads 14 and 16 are preferably separately driven by hydraulic motors generally designated by the numerals 18 and 28 to permit the treads to be independently operated for maneuvering and positioning the machine 10 in a conventional manner. The main frame 12 has a horizontally positioned turntable 22 mounted thereon.

A platform generally designated by the numeral 24 has a plurality of depending brackets 26 secured thereto with rollers 28 extending laterally therefrom. The rollers 28 are positioned between the outwardly extending flanges 30 and 32 of turntable 22 to permit the platform 24 to revolve about the turntable 22. The turntable 22 has an internal ring gear 34 (FIGURE 4) and the platform 24 has a spur gear 36 rotatably secured thereto in meshing relation with the ring gear 34. A drive motor 38 is suitably connected to gear 36 through flexible coupling 40 and a right angle gear reducer 42 to rotate gear 36 about vertical shaft 44. With this arrangement, rotation of gear 36 revolves the platform 24 on the turntable 22.

The platform 24 has a pair of upstanding brackets 46 and 48 arranged in spaced parallel relation to each other. The brackets each have a semicircular recess portion 50 adjacent the upper edge which mates with a second semicircular portion 52 in a cap member 54 to form a pair of spaced circular apertures in the brackets 46 and 48 to receive portions of the shafts 56 of trunnion 58 that is secured to the telescopic boom generally designated by the numeral 60 (FIGURE 6). Mounted on the platform 24 is a prime mover 62 such as an internal combustion engine that has an output shaft 64 connected through a suitable clutch 66 to a hydraulic pump 68. The pump 68 is connected through suitable flexible conduits (not shown) and to valves generally designated by the numeral 70 located on the operators console 72. Suitable flexible conduits extend from the valves 70 to the various self-contained hydraulic actuating mechanisms to be later described. The platform 24 also has mounted thereon an operators seat 74 and a hydraulic reservoir 76 located adjacent to the hydraulic pump 68. Also positioned on the platform 24 are fuel tanks 78 for the engine or prime mover 62. Where desired, a source of compressed air, such as an air compressor, may also be mounted on the platform 24 to provide compressed air for the percussive tool on the machine 10.

As illustrated in FIGURES 1 and 5, the platform 24 has an actuating cylinder 80 pivotally mounted thereon. The cylinder 80 has a rod 82 connected to a lever bracket 84 by means of a pin connection 86. The cylinder 80 is pivotally mounted to the platform 24 by means of the bracket 88 and the trunnion 90. The trunnion shaft 56 extending transversely from the boom 60 is keyed to the lever bracket 84 so that movement of the lever brackets 84, by longitudinal movement of piston rod 82, as indicated by the arrows in FIGURE 5, pivots the tubular boom 60 about a transverse axis so that the boom is movablefrom the position illustrated in full lines in FIGURE 2 to the positions indicated in phantom lines.

' The tubular boom generally designated by the numeral 60 is illustrated in detail in FIGURES 6, 7 and 8 and has an outer cylindrical tubular member 92 with the trunnion 58 secured thereto by means of the weld 94. An inner cylindrical tubular member96 is secured at its rear end portion by means of an annular flange 98 to the outer tubular member 92 to provide an annular cylinder 97 therebetween. The inner tubular member 96 has a front portion 98 of reduced diameter to provide increased cross sectional area for the front portion of the annular cylinder 97. An extensible cylindrical tubular member generally designated by the numeral 100 has a tubular rear end portion 102 and a front tubular portion 104. of reduced diameter. The tubular members 102 and 104 are secured to each other 106 to provide a double acting piston arrangement of the telescopic member within the annular cylinder 94. A pair of longitudinally extending splines 108 are secured'to inner member 98 and are positioned in a pair of slots 109 in ring 111 secured to the rear edge of member 104 to prevent rotation of the telescopic member 100 within the annular cylinder 97. There are provided openings at in the outer member 92 adjacent the rear portion of the boom 60 to supply hydraulic fluid under pressure to the rear portion of annular cylinder 97. A suitable seal 112 is secured to the rear edge of the telescopic tubular member 102 within the annular cylinder so that a hydraulic pressure exerted on a rear edge portion of the tubular member 102 will extend the telescopic tubular member generally designated by the numeral 100 relative to the fixed portions of the boom 60.

Similarly, an inlet is provided for the front annular space 114 of annular cylinder 97 between the fixed tubular member 92 and movable tubular member 104 to supply hydraulic fluid under pressure to an annular front edge 116 of the member 102 to retract the telescopic portion of the boom 60. Annular bearings 113 and are provided between the telescopic tubular members to support the load when the tubular portion 100 is in an extended position. With this arrangement, a self-contained double acting cylinder is provided with the telescopic portion of the boom having annular surfaces which serve as annular pressure faces or pistons for the extensible portion of the boom 60. The boom 60 has an extensible portion that may be rapidly extended or retracted by the large annular surface area provided for the piston faces and maintained in a preselected extended position by the hydraulic fluid within the annular cylinders. The cylindrical tubular arrangement of the boom 60 provides a rigid structure capable of withstanding the substantial forces required in dislodging pieces of the refractory material after the per cussive tool is imbedded therein. Suitable seals such as seals 118, 112 and 120 prevent the escape of hydraulic fluid from the annular cylinder 97. The tubular boom 60 has a central longitudinal bore 122 therethrough for the hydraulic conduits that extend to the mounting head generally designated by the numeral 124.

The mounting head 124, illustrated in FIGURES 9, 10, 11 and 11a, has a U-shaped pivot mount 128 with a rearwardly extending member 130 that is positioned within the tubular boom mounting means 126 and secured thereto by means of bolts 132. The mounting head has a plate like front end portion 134 secured to the U-shaped 128 that permits the boom 60 to be used as a ram or the like. Mounted within the U-shaped body portion 128 is a pivot cylinder generally designated by the numeral 136 that has end walls 137 (FIGURE 11a). The pivot cylinder has a shaft 138 extending therethrough and beyond the end Walls 137 of the cylinder 136. The shaft 138 is suitably supported in the cylinder end walls 137 and has a vane 140 extending laterally therefrom and abutting the inner cylindrical wall 142 of cylinder 136. A suitable seal 144 extends longitudinally along the peripheral edges of the vane 140 between the inner cylindrical wall 142 and the end walls 137 to provide a fluid seal therebetween. Within the cylinder 136 there is a longitudinally extending fixed vane 146 secured to and extending outwardly from the cylindrical wall 142 into abutting relation with the shaft 138. Suitable peripheral seals 148 are positioned between the shaft 138 and the adjacent edge of the vane 146. With this arrangement, there is a fluid tight connection between the shaft 138 and the fixed vane 146 to divide the internal portion of the cylinder 136 into upper and lower chambers. The vane 146 has a first passageway 150 therethrough that opens into the upper chamber 152, as illustrated in FIGURES 11 and 11a, and a second passageway 154 that opens into the lower chamber 156. With this arrangement, when hydraulic fluid under pressure is supplied through passageway 150 to the upper chamber 152 the movable vane 140 and shaft 138 rotate in a clockwise direction as viewed in FIGURE 11. Likewise; when hydraulic fluid under pressure is supplied through passageway 154 to the lower chamber 156 the movable vane 140 and shaft 138 rotate in a counterclockwise direction, as viewed in FIGURE 11. When the shaft 138 has assumed a preselected position, it remains in the fixed position until the hydraulic fluid is released from one of the chambers through the previously described passages.

A tool holder generally designated by the numeral 158 has a body portion 160 with a pair of spaced brackets 162 and 164 extending upwardly therefrom, as viewed in FIG- URE 10. The brackets 162 and 164 have apertures therethrough and the ends of shaft 138 associated with the pivot cylinder 136 extend therethrough. The ends of shaft 138 are suitably keyed to the brackets 162 and 164, as is illustrated in FIGURE 9. Thus, upon rotation of shaft 138 the tool holder 158 rotates or pivots about the longitudinal axis of shaft 138 which is transverse to the longitudinal axis of the boom 60. The tool holder body portion 160 has a suitable mounting means 166 for a percussive tool holder 168. A percussive tool 170 extends beyond the base 172 of the tool holder body portion 160, as is illustrated in FIGURES 9 and 10. Suitable connections for compressed air for the percussive tool 168 are provided wherein the percussive tool, such as a conventional air hammer, may be actuated by the compressed air.

The machine previously described provides actuating means for rotating the platform 24 having the boom mounted thereon about the frame 12. Further, the boom 60 mounted on the platform 24 is arranged to pivot about the trunnion shaft 56. The hydraulic fluid supplied to cylinder 80 pivots the boom 60 about this transverse axis, as is illustrated in FIGURE 2. The boom 60 is provided with? a self-contained annular double acting cylinder so that the boom has a telescopic portion 100 that may be extended and retracted, as is also illustrated in FIGURE '2. Secured to the end of the boom 60 is a mounting head 124 with a self-contained hydraulic actuator therein. The hydraulic actuator is connected to the tool holder and pivots the tool holder about the shaft 138 which is transverse to the longitudinal axis of the boom 60. With this arrangement, the percussive tool 170 may be positioned, as is illustrated in FIGURE 2.

In operation the tool holder 158 is positioned angularly relative to the boom 60 with the percussive tool 170 extending upwardly substantially, as illustrated in phantom lines in FIGURE 2. The percussive tool 170 then penetrates the refractory material by actuating the percussive tooland pivoting the boom 60' u wardly about trunnion shaft 56. The rotation of boom 60 moves the tool 170 in an upward direction into the refractory material. After the percussive tool 170 has penetrated the refractory material a preselected distance, the hydraulic fluid is supplied to thelower chamber 156- of cylinder 1'38 to rotate or pivot the tool holder relative to the end of the boom 60. Inthis manner, a portion of the refractory material fractures at a point where the percussive tool 170 has penetrated and a large piece of the refractory materialbreaks away from the lining; The operation is repeated and the refractory lining is rapidly removed: from the furnacewall. It should be understood,'however, the delining machine 10 may be? operatedin other sequences'ofboom pivot, boom extension, and: tool holder pivot to penetrate and dislodge the'refractory lining.

Where it is desired to utilizet-he self-contained hydraulic actuator within the mounting head 124 to both breakaway the refractory material and to also move the broken piece of refractory material laterally, a dual motion mounting head, as is illustrated in FIGURES.- 12-1'5, may be substituted for the mounting head illustrated in FIGURES 9'and10.

The dual motion mounting head generally designated by thenumera-l' 174* has a body portion 176 with a rearwardly extending cylindrical portion 178. The rearwardly extending cylindrical portion 178 has a rectangular shaft 6 end portion extending rearwardly therefrom. The cylindrical portion 178 is positioned in a receiver gener'ally designated by the numeral 182.

The receiver 182 is secured to the end of the boom 60 by" means of aweld 184: The receiver'182 has" a cylindrical body portion 186 with a cup shaped recess portion 188 having? an annular front edge portion 190 and a longitudinal bore 192 through a rear wall 193. The cup shaped recess portion 188 has a portion 194 of reduced diameter adjacent the rear Wall 193 in which a bearing 196 is positioned. The receiver 182 has a plurality of radially extending threaded apertures 198 in which bolts 200 are positioned and secure the rectangular shaft end portion 180 therein. The mounting head rear cylindrical portion 178 is positioned in the cup shaped recess portion 188 in receiver 182' with an annular bearing 202 there'between to permit rotation of the mounting head cylindrical portion 178 relative to the receiver 182.

The rectangular shaft end portion 180 is positioned in the longitudinal rectangular bore 192 and secured therein by bolts 2.00. The rectangular shaft end portion 180 forms a portion of shaft 204 that is fixed relative to the rotatable mounting head cylindrical portion 178 as will be later described. The rearwardly extending cylindrical portion 178 has a cylindrical. chamber 296 formed therein with the shaft 204 extending longitudinally therethrough. The shaft 204 has an elongated vane 208- seeured thereto and extending radially therefrom with a peripheral seal 210 extending around the edges thereof between the walls of the cylindrical chamber 206 and the vane 208'. Extending radially inwardly from the cylindrical wall 212 of chamber 206 is a fixed vane 214' with a peripheral seal 216 between the shaft 204 and the edge of vane 214. With this arrangement, the cylindrical chamber 206 is divided into two compartments 218 and 220 between the vane 214' fixed to the chamber Wall and vane 208 fixed to shaft 204' (see FIGURE 15). A pair of ports 222 and 224 extend through the shaft 204 into the annular bore 122 of the tubular boom 60 and are arranged to supply hydraulic fluid under pressure to the respective chambers 218 and 220. The mounting head cylindrical member is suitably mounted in bearings 226 and 228 on shaft 204. Since the shaft 204 is fixedly secured to the receiver 182 by the bolts 200 the mounting head body portion 176 will. rotate about the axis of shaft 204 as hydraulic fluid under pressure is supplied through the ports 222'or 224- to the chambers 218 and 220. The rotation of the body portion 176 about the shaft 204 will pivot the tool holder 158 about the longitudinal axis of shaft 264. With this arrangement, the tool holder 158 has a pivotal motion that permits lateral motion of the tool holder 158' by means of the self-contained hydralic actuator within the dual motion head 174.

The mounting head body port-ion 176 has a cylindrical chamber 230 with a shaft 232 extending longitudinally therethr'ough. The shaft 232 is rotatable relative to the body portion: 176, as is indicated by the arrows in FIG- URE 13, and has a vane 234 with a peripheral seal 236 to provide a fluid tight connection between the peripheral edges of the vane 234 and theinner cylindrical wall 238 of cylinder 230. A fixed vane 240 extends from the cylindrical wall 238 into abutting relation with the shaft 232, suitable peripheral seals 242 provide fluid tight connections between the shaft 232 and the fixed vane 240. The cylindrical chamber 230 is thus divided to an upper chamber 2'44 and lower chamber 246 by means of a fixed vane240' and-movablevane 234. Extending through the'shaft 204' are a second pair of passages 248 and 250 (FIGURE 14) that'ar earranged to supply hydraulic fluid under pressure to the upper and lower chambers 244 and 246 to thereby rotate the shaft 232 in. a preselected direction in a manner substantially similar to that previously described with respect to the mounting head 124 illustrated in FIGURE 11.

It will thusbe apparent with this arrangement that the tool holder is provided with a lifting motion to fracture or break the refractory material and a lateral motion to move the fractured or broken portion of the refractory material laterally.

With the dual motion mounting head 174, illustrated in FIGURES 12l5, it is possible to fracture and move the dislodged refractory material laterally in the following manner. The tool holder 158 may be angularly positioned relative to the boom 60 with the percussive tool 170 extending forwardly toward the furnace wall. The percussive tool 170 is then actuated and penetrates the refractory material by pivoting the boom 60. The pivoting of the boom 60 in a vertical plane thus moves the tool 170 into the refractory material. After the percussive tool has penetrated the refractory material a preselected distance, hydraulic fluid is supplied to the chamber 246 in the dual motion head 174 to pivot the tool horder upwardly relative to the end of the boom 60. The upward movement of the tool 17! fractures the refractory material so that a piece of substantial size is dislodged from the surrounding refractory material and also from the furnace wall. The broken piece of refractory material is resting on the percussive tool 170. Thereafter hydraulic fluid is supplied throughout the ports 222 or 224 to the chambers 218 or 220 of the cylinder 206 in the dual motion head 174 to rotate the head body portion 176 about the axis of shaft 204 to thus swing the tool 170 in a side Wise direction to move the dislodged piece of refractory material laterally. The above described side wise motion of the tool holder accelerates the removal of refractory material in that the tool not only dislodges pieces of the refractory from the furnace wall but also displaces the dislodged pieces laterally so that the dislodged pieces may fall by gravity to the base of the furnace. It should be understood, that other types of percussive tools others than the pointed tool 170, illustrated in the drawings, may be used. For example, a tool having a flat front edge portion may be used as both a penetrating tool and as a dislodging tool. The side wise movement of the tool holder 158 adds versatility to the delining machine It} and permits the machine to be used to perform other operations in the removal of a refractory lining. It should be understood, however, that the delining machine with the dual motion head 174 may be operated in other sequences than above described to penetrate and dislodge the refractory lining.

For clarity and brevity the fluid conduits from the hydraulic pump 68 to the various valves and the hydraulic actuators were omitted. The conduits to the hydraulic actuators in the heads 124 and 174 may extend through the bore 122 in the tubular boom 60 and thus minimize to a substantial extent the possibility of damage to the flexible conduits by pieces of dislodged refractory material.

According to the provisions of the patent statutes, I have explained the principle, preferred construction, and mode of operation of my invention and have illustrated and described what I now consider to represent its best embodiments. However, I desire to have it understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically illustrated and described.

I claim:

1. In a mobile furnace delining machine the combination comprising,

a frame member,

propelling means for supporting and propelli said frame member on an underlying surface,

a platform mounted on said frame member for rotation about a vertical axis relative to said frame memher,

an extensible cylindrical tubular boom member pivotally mounted on said platform, said boom member arranged to pivot in a vertical plane about a transverse axis intermediate the boom end portions, eans to pivot said cylindrical tubular boom member relative to said platform,

said cylindrical tubular boom member having axially aligned and telescopically positioned tubular members,

hydraulic actuating means to axially move certain of said tubular members relative to other of said tubular members,

a tool holder mounting head secured to an end portion of said cylindrical tubular boom member,

said mounting head having a hydraulic actuator ar ranged transversely to the longitudinal axis of said cylindrical boom member,

said hydraulic actuator having a shaft member rotatably mounted therein, said shaft member extending transversely to the longitudinal axis of said cylindrical boom member and having end portions extending beyond said hydraulic actuator,

a tool holder having an end portion connected to said shaft end portions for rotation therewith so that upon actuation of said hydraulic actuator said tool holder pivots relative to said cylindrical boom in a vertical plane, and

a percussive tool mounted in said tool holder and extending forwardly therefrom.

2. A mobile furnace delining machine as set forth in claim 1 in which said extensible cylindrical tubular boom member includes,

a fixed first tubular member having an elongated annular chamber therein,

a movable second tubular member axially positioned relative to said fixed tubular member in said annular chamber, said second tubular member having an annular end portion forming an annular piston within said chamber,

means nonrotatably connecting said second tubular member to said first tubular member within said annular chamber, and

means to supply fluid under pressure to a surface of said tubular member annular piston to thereby telescopically move said second tubular member relative to said first tubular member.

3. A mobile furnace delining machine as set forth in claim 1 in which said extensible cylindrical tubular boom member includes,

an inner tubular member and an outer tubular member,

said inner tubular member having a front portion of reduced diameter and an annular flanged rear end portion,

said inner tubular member axially positioned within said outer tubular member with said annular flanged rear end portion abutting the rear edge portion of said outer tubular member and forming an annular chamber therebetween,

a movable tubular member having a front portion of reduced diameter axially positioned in said annular chamber and having an enlarged rear end portion adjacent said annular flanged rear end portion and forming an annular piston within said chamber, said inner tubular member having longitudinally extending splined portions extending into said chamber,

said splined portions extending into recessed portions in said movable member to nonrotatably position said movable tubular member within said chamber,

said movable tubular member having a shoulder portion adjacent said front portion of reduced diameter operable as a second annular piston within said chamber,

means to supply fluid under pressure to the rear end of said annular chamber to telescopically move said movable tubular member outwardly and increase the effective length of said cylindrical boom, and

means to supply fluid under pressure to the front end of said annular chamber to telescopically move said movable member inwardly and decrease the effective length of said cylindrical boom.

4. A mobile furnace delining machine as set forth in claim 1 in which said tool holder mounting head includes,

a body member having a cylindrical 'chamber, said cylindrical chamber having a longitudinal axis extending transversely to said boom longitudinal axis,

said shaft member axis positioned in said cylindrical chamber and having end portions extending through saidvertical endwalls beyond said body portion, and

means within said cylindrical chamber to rotate said shaft relative thereto and pivot said tool holder in a vertical plane relative to said cylindrical boom member.

5. A mobile furnace delining machine as set forth in claim 1 in which said tool holder mounting head includes,

a body member having a cylindrical chamber with a cylindrical inner wall and vertical end walls, said cylindrical chamber having a longitudinal axis extending transversely to said boom member longitudinal axis,

said shaft member axially poistio'ncd in said cylindrical chamber and having said end portions extending through said vertical end walls beyond said body portion,

said shaft member having a movable vane member secured thereto'and extending radially therefrom into abutting relation with said chamber inner wall, said vane member rotatable with said shaft member,

seal means extending around the peripheral edge portion of said vane member,

a fixed vane member extending radially inwardly from said chamber inner wall into abutting relation with said shaft member,

seal means between said fixed vane member and said shaft,

said fixed vane member and said movable vane member forming a pair of variable volume chambers within said cylindrical chamber, and

means adjacent to said fixed vane to supply fluid under pressure to said pair of variable volume chambers to thereby rotate said shaft member and pivot said tool holder in a vertical plane relative to said cylindrical boom member.

6. A mobile furnace delining machine as set forth in claim 1 in which said tool holder mounting head includes,

means to pivot said tool holder in a vertical plane relative to said cylindrical boom, and

other means to move said tool holder about the longitudinal axis of said cylindrical boom.

7. A mobile furnace delining machine as set forth in claim 1 in which said tool holder mounting head includes,

a body member having a cylindrical chamber with a cylindrical inner wall and vertical end walls, said cylindrical chamber having a longitudinal axis extending transversely to said boom member longitudinal axis,

said shaft member axially positioned in said cylindrical chamber and having said end portions extending through said vertical end walls beyond said body portion,

said shaft member having a movable vane member secured thereto and extending radially therefrom into abutting relation with said chamber inner wall, said vane member rotatable with said shaft member,

seal means extending around the peripheral edge portion of said vane member,

a fixed vane member extending radially inwardly from said chamber inner wall into abutting relation with said shaft member,

seal means between said fixed vane member and said shaft,

said fixed vane member and said movable vane member forming a pair of variable volume chambers within said cylindrical chamber,

means adjacent to said fixed vane to supply fluid under pressure to said pair of variable volume chambers to thereby rotate said shaft member and pivot said tool 10 holder in a vertical plane relative to said cylindrical boom member, and r g v H M other means to move saidtoolholder about the longitudinal axis of said cylindrical boom member.

8. A mobile furnace delining. machine as set forth in claim 1 in which said tool holder mounting head includes,

a bodyjmember having acylindrical chamber with a cylindrical inner wall and vertical end walls, said cylindrical chamber having a longitudinal axis extending parallel to said boonr jmember longitudinal axis,

a second shaft member axially positioned in said cylindrical chamber and having, end portions extending through said vertical end walls beyond said body portion, I

said second shaft member having one end nonrotatably secured to said cylindrical boom member,

said second shaft member having a vane member secured theretoand extending radially therefrom into abutting relation with saidchamberinnerwall,

seal means extending around the peripheral edge portion of said vane member, g

a second vane member secured to said cylindrical chamber inner wall and extending radially inwardly therefrom into abutting relation with said shaft member,

seal means between said second vane member and said shaft,

said first vane member and said second vane member forming a pair of variable volume chambers within said cylindrical chamber, and

means to supply fluid under pressure to said pair of variable volume chambers to thereby rotate said body member with said cylindrical chamber about said shaft member and move said tool holder about the longitudinal axis of said cylindrical boom.

9. A mobile furnace delining machine as set forth 1n claim 1 in which said tool holder mounting head includes,

a body member having a first cylindrical chamber with a' cylindrical inner wall and vertical end walls, said cylindrical chamber having a longitudinal axis extending transversely 'to said boom member lo'ng'ltudinal axis, 7

said shaft member axially positioned in said cylindrical chamber and having said end portions extending through said vertical end walls beyond said body portion, 7

said shaft member having a first vane fne'mbe'r -secured thereto and extending radially therefrom into abutting relation with said chamber inner wall, said vane member rotatable with said shaft member, 7

seal means extending around the peripheral edge portion of said vane member.

a second vane member extending radially inwardly from said chamber inner wall into abutting relation with said shaft member,

seal means between said second vane member and said shaft,

said second vane member and said first vane member forming a first pair of variable volume chambers within said cylindrical chamber,

means adjacent to said second vane member to supply fluid under pressure to said pair of variable volume chambers to thereby rotate said shaft member and pivot said tool holder in a vertical plane relative to said cylindrical boom member,

said body member having a second cylindrical chamber with a cylindrical inner wall and vertical end walls, said second cylindrical chamber having a longitudinal axis extending parallel to said boom member longitudinal axis,

a second shaft member axially positioned in said second cylindrical chamber and having end portions extending through said vertical end walls beyond said second cylindrical chamber,

said second shaft member having one end nonrotatably secured to said cylindrical boom member,

said second shaft member having a third vane member secured thereto and extending radially therefrom into abutting relation with said chamber inner wall,

seal means extending around the peripheral edge portion of said third vane member,

a fourth vane member secured to said cylindrical chamber inner wall and extending radially inwardly therefrom into abutting relation with said shaft member,

seal means between said fourth vane member and said shaft,

said third vane member and said fourth vane member forming a second pair of variable volume chambers within said cylindrical chamber, and

means to supply fiuid under pressure to said second pair of variable volume chambers to thereby rotate said body member about said second shaft member and move said tool holder about the longitudinal axis of said cylindrical boom.

10. In a mobile furnace delining machine the combination comprising,

a frame member,

propelling means for supporting and propelling said frame member on an underlying surface,

a platform mounted on said frame member for rotation about a vertical axis relative to said frame member,

an extensible boom member pivotally mounted on said platform and arranged to pivot in a vertical plane,

means to pivot said boom member relative to said platform,

a tool holder mounting head secured to an end portion of said boom member,

said tool holder mounting head having a body member with a first cylindrical chamber having a cylindrical inner wall and vertical end walls, said cylindrical chamber having a longitudinal axis extending transversely to said boom member longitudinal axis,

a first shaft member axially positioned in said cylindrical chamber and having end portions extending through said vertical end walls beyond said body portion,

said first shaft member having a first vane member secured thereto and extending radially therefrom into abutting relation with said chamber inner wall, said first vane member rotatable with said shaft member,

seal means extending around the peripheral edge portion of said first vane member,

a second vane member extending radially inwardly from said chamber inner wall into abutting relation with said first shaft member,

seal means between said second vane member and said first shaft member,

said second vane member and said first vane member forming a first pair of variable volume chambers within said cylindrical chamber,

means adjacent to said second vane member to supply fluid under pressure to said first pair of variable volume chambers to thereby rotate said first shaft member,

said body member having a second cylindrical chamber with a cylindrical inner wall and vertical end walls, said second cylindrical chamber having a longitudinal axis extending parallel to said boom member longitudinal axis,

a second shaft member axially positioned in said second cylindrical chamber and having end portions extending through said vertical end walls beyond said second cylindrical chamber,

said second shaft member having one end nonrotatably secured to said boom member,

said second shaft member having a third vane member secured thereto and extending radially therefrom into abutting relation with said chamber inner wall,

seal means extending around the peripheral edge portion of said third vane member,

a fourth vane member secured to said cylindrical chamber inner wall and extending radially inwardly therefrom into abutting relation with said second shaft member,

seal means between said fourth vane member and said second shaft member,

said third vane member and said fourth vane member forming a second pair of variable volume chambers within said second cylindrical chamber,

means to supply fluid under pressure to said second pair of variable volume chambers to thereby rotate said body member about said second shaft member,

a tool holder connected to said tool holder mounting head and connected to said first shaft end portions for rotation therewith so that rotation of said first shaft member pivots said tool holder in a vertical plane relative to said boom member and rotation of said tool holder mounting head body member about said second shaft member moves said tool holder about the longitudinal axis of said boom member, and

' a percussive tool mounted in said tool holder and extending forwardly therefrom.

References Cited UNITED STATES PATENTS 2,350,066 5/1944 Parker 92--121 2,423,787 7/1947 Mosena et a1. 173-43 2,915,044 12/1959 Nelson 9212l 2,931,060 4/1960 Kelly 17343 2,983,496 5/1961 Grant 173-43 3,195,656 7/1965 Johnson et a1. 173-38 FRED c. MATTERN, JR., Primary Examiner.

L. P. KESSLER, Assistant Examiner. 

1. IN A MOBILE FURNACE DELINING MACHINE THE COMBINATION COMPRISING, A FRAME MEMBER, PROPELLING MEANS FOR SUPPORTING AND PROPELLING SAID FRAME MEMBER ON AN UNDERLYING SURFACE, A PLATFORM MOUNTED ON SAID FRAME MEMBER FOR ROTATION ABOUT A VERTICAL AXIS RELATIVE TO SAID FRAME MEMBER, AN EXTENSIBLE CYLINDRICAL TUBULAR BOOM MEMBER PIVOTALLY MOUNTED ON SAID PLATFORM, SAID BOOM MEMBER ARRANGED TO PIVOT IN A VERTICAL PLANE ABOUT A TRANSVERSE AXIS INTERMEDIATE THE BOOM END PORTIONS, MEANS TO PIVOT SAID CLYINDRICAL TUBULAR BOOM MEMBER RELATIVE TO SAID PLATFORM, SAID CYLINDRICAL TUBULAR BOOM MEMBER HAVING AXIALLY ALIGNED AND TELESCOPICALLY POSITIONED TUBULAR MEMBERS, HYDRAULIC ACTUATING MEANS TO AXIALLY MOVE CERTAIN OF SAID TUBULAR MEMBERS RELATIVE TO OTHER OF SAID TUBULAR MEMBERS, A TOOL HOLDER MOUNTING HEAD SECURED TO AN END PORTION OF SAID CYLINDRICAL TUBULAR BOOM MEMBER, SAID MOUNTING HEAD SECURED TO AN END PORTION RANGED TRANSVERSELY TO THE LONGITUDINAL AXIS OF SAID CYLINDRICAL BOOM MEMBER, SAID HYDRAULIC ACTUATOR HAVING A SHAFT MEMBER ROTATABLY MOUNTED THEREIN, SAID SHAFT MEMBER EXTENDING TRANSVERSELY TO THE LONGITUDINAL AXIS OF SAID CYLINDRICAL BOOM MEMBER AND HAVING END PORTIONS EXTENDING BEYOND SAID HYDRAULIC ACTUATOR, A TOOL HOLDER HAVING AN END PORTION CONNECTED TO SAID SHAFT END PORTIONS FOR ROTATION THEREWITH SO THAT UPON ACTUATION OF SAID HYDRAULIC ACTUATOR SAID TOOL HOLDER PIVOTS RELATIVE TO SAID CYLINDRICAL BOOM IN A VERTICAL PLANE, AND A PERCUSSIVE TOOL MOUNTED IN SAID TOOL HOLDER AND EXTENDING FORWARDLY THEREFROM. 